The Silmarillion is a collection of mythopoeic stories by the English writer J.R.R. Tolkien, edited and published posthumously by his son, Christopher Tolkien, in 1977, with assistance from fantasy fiction writer Guy Gavriel Kay. It is the primary source of Middle-earth's ancient history and provides a background to his other works, including 'The Hobbit' and 'The Lord of the Rings.'